Welcome to the site!
There really is no difference in hard parts between 79-93 that I'm aware of, so things like an oil pan or engine mounts will all interchange.
Now in your case, as far as I'm aware, and I'm sure others will jump in and give their knowledge, is that you'll most likely have problems with exhaust manifold/header fitment with P heads. You'll also want an engine harness from a FI car, preferably a 93 as there are slight differences from year to year. I'm not 100% sure which years are 100% compatible, but I do know that there are some differences - one of note is the O2 sensor harness. I also know that some years, like your 93, have the air bag harness tied into the engine harness, so that's something to keep in mind as well. You'll also want the appropriate PCM unless you're going with an aftermarket FI system like the Holley Terminator X. But as far as strictly engine components, everything more or less stayed the same between 87-93 as far as I'm aware. Like I said, I'm sure someone with more knowledge will most likely be along soon and can give more/better information than I....
OH - and post some pics and maybe start a build thread! Everyone loves to see pics!